WO2022270697A1 - Butée de surface portante - Google Patents

Butée de surface portante Download PDF

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Publication number
WO2022270697A1
WO2022270697A1 PCT/KR2021/018130 KR2021018130W WO2022270697A1 WO 2022270697 A1 WO2022270697 A1 WO 2022270697A1 KR 2021018130 W KR2021018130 W KR 2021018130W WO 2022270697 A1 WO2022270697 A1 WO 2022270697A1
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WO
WIPO (PCT)
Prior art keywords
foil
bump
elastic bumps
plate
thrust bearing
Prior art date
Application number
PCT/KR2021/018130
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English (en)
Korean (ko)
Inventor
임재만
김경동
Original Assignee
주식회사 뉴로스
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Filing date
Publication date
Application filed by 주식회사 뉴로스 filed Critical 주식회사 뉴로스
Publication of WO2022270697A1 publication Critical patent/WO2022270697A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
    • F16C17/042—Sliding-contact bearings for exclusively rotary movement for axial load only with flexible leaves to create hydrodynamic wedge, e.g. axial foil bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings
    • F16C32/0603—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings supported by a gas cushion, e.g. an air cushion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/43—Screw compressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/44—Centrifugal pumps

Definitions

  • the present invention relates to an air foil thrust bearing supporting an axial load acting on a rotating shaft in a turbo blower or a turbo compressor that compresses and supplies air by rotating an impeller at high speed using a rotational force of a motor.
  • a thrust bearing is used to support an axial load in a turbo blower or a turbo compressor.
  • thrust bearings air foil thrust bearings are mainly used to support the axial load of a rotating shaft rotating at high speed.
  • a conventional air foil thrust bearing includes a base plate 10 formed of a donut-shaped plate, a plurality of bump foils 20 arranged spaced apart from each other along the circumferential direction, and disposed on each bump foil 20. It is composed of a plurality of top foils (30).
  • the air foil thrust bearing is fixed by spot welding a plurality of bump foils 20 on the base plate 10, and after the top foil 30 is disposed on each bump foil 20, the base plate 10 ), the top foils 30 are fixed by spot welding. And when such an air foil thrust bearing is mounted and used in a turbo blower, a lot of frictional heat is generated due to contact between the disk-shaped thrust runner coupled to the rotating shaft and rotating together with the top foil of the air foil thrust bearing.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to first support a load when excitation with a part having the largest energy loss according to the rotational speed of the rotating body, thereby causing damping friction in the first place. It is to provide an air foil thrust bearing capable of improving durability by separating the support portion.
  • An air foil thrust bearing of the present invention for achieving the above object includes a base plate; a bump foil formed with concavo-convex elastic bumps, stacked on the base plate, and having one end in a circumferential direction coupled to the base plate; and a top foil stacked to cover the bump foil and having one end in a circumferential direction coupled to the base plate.
  • a height of elastic bumps in a partial region adjacent to an outer diameter side in a radial direction may be lower than a height of elastic bumps in a remaining region.
  • the bump foil may be formed with slits penetrating both surfaces in the thickness direction while going along the circumferential direction from the free end.
  • elastic bumps corresponding to a partial area may be formed to have the same height from the free end, which is the other end in the circumferential direction, to one side of the bump foil on a specific radius.
  • the air foil thrust bearing of the present invention includes a base plate; a bump foil formed with concavo-convex elastic bumps, stacked on the base plate, and having one end in a circumferential direction coupled to the base plate; a top foil stacked to cover the bump foil and having one end in a circumferential direction coupled to the base plate; and an insert plate interposed between the base plate and the bump foil in a portion corresponding to the remaining area except for a portion adjacent to the outer diameter side in the radial direction of the bump foil. It can be made including.
  • the bump foil may be formed with slits penetrating both surfaces in the thickness direction while going along the circumferential direction from the free end.
  • elastic bumps corresponding to a partial area may be formed to have the same height from the free end, which is the other end in the circumferential direction, to one side of the bump foil on a specific radius.
  • the bump foils may have the same height as each other except for the insert plate.
  • the air foil thrust bearing of the present invention includes a base plate; a bump foil formed with concavo-convex elastic bumps, stacked on the base plate, and having one end in a circumferential direction coupled to the base plate; and a top foil stacked to cover the bump foil and having one end in a circumferential direction coupled to the base plate.
  • concave stepped grooves may be formed in a circumferential direction at a portion corresponding to the elastic bumps in a partial region adjacent to an outer diameter side in a radial direction of the bump foil.
  • the bump foil may be formed with slits penetrating both surfaces in the thickness direction while going along the circumferential direction from the free end.
  • elastic bumps corresponding to a partial area may be formed to have the same height from the free end, which is the other end in the circumferential direction, to one side of the bump foil on a specific radius.
  • the bump foils may have the same height as each other.
  • the air foil thrust bearing of the present invention includes a bump foil plate in which a bump foil is integrally formed with a first plate and is connected to the first plate, and concavo-convex elastic bumps are formed on the bump foil plate; and a top foil plate having a top foil integrally formed with the second plate, the top foil connected to the second plate, and stacked on the bump foil plate such that the top foil covers the bump foil.
  • a height of elastic bumps in a partial region adjacent to an outer diameter side in a radial direction may be lower than a height of elastic bumps in a remaining region.
  • the bump foil of the bump foil plate is composed of a plurality, each of the plurality of bump foils has one end connected to the first plate in a circumferential direction, and the plurality of bump foils are arranged spaced apart from each other along the circumferential direction,
  • the top foil of the top foil plate is composed of a plurality, and each of the plurality of top foils has one end connected to the second plate in a circumferential direction, and the plurality of top foils are spaced apart from each other along the circumferential direction to form the plurality of bump foils. It can be arranged in a position corresponding to.
  • the bump foil may be formed with slits penetrating both surfaces in the thickness direction while going along the circumferential direction from the free end.
  • the height of the elastic bumps in a partial area adjacent to the outer diameter in the radial direction may be lower than the height of the elastic bumps in the remaining area by the insert plate.
  • the bump foils may have the same height as each other.
  • the top foil plate may further include a bearing housing stacked on a surface opposite to the bump foil plate on which the top foil plate is stacked, wherein the bearing housing corresponds to elastic bumps in a partial area adjacent to an outer diameter side of the bump foil in a radial direction.
  • a concave stepped groove is formed in the circumferential direction, and the height of the elastic bumps in a partial region adjacent to the outer diameter in the radial direction may be lower than the height of the elastic bumps in the remaining region by the stepped groove of the bearing housing.
  • the elastic bumps of the bump foil may be formed to have the same height as each other in the elastic bumps disposed in the radial direction.
  • the air foil thrust bearing of the present invention has the advantage of having higher durability because the primary damping friction part is separated from the region where the energy loss according to the speed of the rotating body is the greatest and when it is excited.
  • FIG. 1 is a perspective view showing a conventional air foil thrust bearing.
  • FIG. 2 is a partial plan view showing an area with the greatest energy loss and a main excitation support in a conventional air foil thrust bearing.
  • 3 to 5 are an exploded perspective view, an assembled perspective view, and an upper plan view showing an air foil thrust bearing according to a first embodiment of the present invention.
  • 6 and 7 are A-A' cross-sectional views and B-B' cross-sectional views of FIG.
  • FIG. 8 is a cross-sectional view showing a state in which a part of the top foil is elastically deformed when the thrust runner, which is a rotation body, in the cross section of FIG. 7 is in contact with the top foil in a state of being rotated at high speed.
  • FIG. 9 is a perspective view showing an embodiment of a bump foil in an air foil thrust bearing according to a first embodiment of the present invention.
  • FIG. 10 is a cross-sectional view showing a portion of an air foil thrust bearing cut in a radial direction according to a second embodiment of the present invention.
  • FIG. 11 is a cross-sectional view showing a portion of an air foil thrust bearing cut in a radial direction according to a third embodiment of the present invention.
  • FIG. 12 is a plan view showing a bump foil in an air foil thrust bearing according to the present invention.
  • 13 to 15 are an exploded perspective view, an assembled perspective view, and an upper plan view showing an air foil thrust bearing according to a fourth embodiment of the present invention.
  • FIG. 16 is a C-C′ cross-sectional view of FIG. 15;
  • 17 is a cross-sectional view showing a portion of an air foil thrust bearing cut in a radial direction according to a fifth embodiment of the present invention.
  • FIG. 18 is a cross-sectional view showing a portion of an air foil thrust bearing cut in a radial direction according to a sixth embodiment of the present invention.
  • FIGS. 6 and 7 are A-A' cross-sectional views and B-B' cross-sectional views of FIG.
  • the air foil thrust bearing according to the first embodiment of the present invention may be largely composed of a base plate 100, a bump foil 200, and a top foil 300.
  • the base plate 100 may be formed in a disk shape in which a hollow hole penetrating both sides in a thickness direction is formed at a central portion.
  • a plurality of bump foils 200 may be arranged spaced apart from each other along the circumferential direction.
  • each of the bump foils 200 may be fixed by welding only one end portion 210 in the circumferential direction to the base plate 100, and the other end portion in the circumferential direction may be formed as a free end.
  • the bump foils 200 may have concavo-convex elastic bumps 220 formed therein, and the elastic bumps 220 may be separated from each other without being fixed even though their lower ends are in contact with the base plate 100 . That is, the rest of the bump foil 200 except for the coupling portion 210 may be in a state where it is not coupled to the base plate 100 and is separated, and the elastic bumps 220 are in contact with the base plate 100. or there may be a slight gap.
  • a plurality of top foils 300 may be arranged spaced apart from each other along the circumferential direction.
  • each of the top foils 300 may be fixed by welding only one end portion 310 in the circumferential direction to the base plate 100, and the other end portion in the circumferential direction may be formed as a free end.
  • the top foils 300 may be disposed at positions corresponding to the bump foils 200 and stacked in such a way that the top foils 300 cover the bump foils 200 . That is, the bump foil 200 may be interposed between the base plate 100 and the top foil 300 .
  • the connecting portion 320 extends upward in a curved or flat shape from the coupling portion 310 along the circumferential direction.
  • a flat portion 330 extending from the connecting portion 320 may be formed parallel to the base plate 100 .
  • the bump foil 200 corresponds to a partial area in one direction from the free end, which is the other end in the circumferential direction, on a specific radius, that is, the elastic bumps 220 corresponding to the flat portion 330 of the top foil 300 have a mutual height.
  • the elastic bumps 220 in an area corresponding to the connecting portion 320 of the top foil 300 may be formed to have a relatively low height. There may be a space between the lower surface of the connection part 320 and the mountains of the elastic bumps 220 .
  • the bump foil 200 when a cross section of the top foil 300 cut in the radial direction at the portion where the flat portion 330 is located, the bump foil 200 has elastic bumps in a partial area adjacent to the outer diameter side in the radial direction.
  • the height h4 of 220 may be lower than the heights h1 , h2 , and h3 of the elastic bumps 220 in the remaining regions, that is, the region adjacent to the inner diameter in the radial direction and the central region.
  • one elastic bump radially adjacent to the outer diameter (on the right side) is the outer diameter side elastic bump
  • the other elastic bump radially adjacent to the inner diameter (left side) is the inner diameter side elastic bump
  • the other elastic bump located at the center in the radial direction is the outer elastic bump.
  • the two elastic bumps are referred to as central elastic bumps
  • the top foil 300 may come into contact with the inner diameter side elastic bumps and the center elastic bumps in a state where no external force such as air pressure acts, and in this state, the outer diameter side elasticity.
  • the peak of the bump may be spaced apart from the top foil 300 due to the height difference ⁇ h.
  • the thrust runner 400 which is a rotating body, rotates at high speed due to an axial load or excitation, and the top foil ( 300)
  • the top foil 300 in the area corresponding to the portion where the outer diameter-side elastic bump is located is bent toward the elastic bump by the pressure of the air flowing between the thrust runner 400 and the top foil 300. It may not come into contact with the thrust runner 400 . That is, in the area adjacent to the outer diameter in the radial direction, the linear velocity is relatively fast, and the energy loss (heat generation) due to friction with air is relatively large. And the top foil 300 can be in direct contact with damping and rubbing.
  • the thrust runner 400 when the thrust runner 400 comes into contact with the top foil 300 due to excitation, etc., it first contacts the flat surface 330 of the top foil 300, and damping and friction occur primarily.
  • the bump foil The flat part 330 of the top foil 300 corresponding to the area where the elastic bumps on the inner diameter side of 200 and the elastic bumps in the center exist is the main excitation support that primarily supports the load of the thrust runner 400. do.
  • the air foil thrust bearing of the present invention can have higher durability because the primary damping friction part does not overlap with the region where the energy loss according to the speed of the rotating body is the greatest and is formed at different positions.
  • the direct friction between the thrust runner and the top foil is reduced in the outer diameter side, which is the area where energy loss is greatest, there is an effect that damage (heat marks) to the coating layer coated on the surface of the top foil may not occur.
  • FIG. 9 is a perspective view showing an embodiment of a bump foil in an air foil thrust bearing according to a first embodiment of the present invention.
  • the bump foil 200 may have slits 230 penetrating both surfaces in the thickness direction while going along the circumferential direction from the free end. That is, for example, a region where the elastic bumps 220 of the bump foil 200 are formed by the slits 230 may be divided into three parts in a radial direction. At this time, the three parts may be in a state of being connected to each other by one end of the coupling part 210.
  • FIG. 10 is a cross-sectional view showing a portion of an air foil thrust bearing cut in a radial direction according to a second embodiment of the present invention.
  • the air foil thrust bearing according to the second embodiment of the present invention may be largely composed of a base plate 100, a bump foil 200, a top foil 300, and an insert plate 150.
  • the base plate 100 and the top foil 300 may be formed in the same manner as in the first embodiment described above.
  • the bump foil 200 may have the same height as the elastic bumps 220 arranged in the radial direction, and the configuration of the rest of the bump foil 200 may be identical to that of the first embodiment described above. there is.
  • the insert plate 150 may be formed in a thin flat plate shape and interposed between the base plate 100 and the bump foil 200 .
  • the insert plate 150 may be disposed in a region where the inner diameter elastic bumps 220 and the center elastic bumps 220 exist in the radial direction.
  • the heights of the inner diameter-side elastic bumps 220 and the center elastic bumps 220 are relatively higher with respect to the upper surface of the base plate 100, and compared to this, the outer diameter-side elastic bumps 220 ) is relatively low.
  • a height difference ⁇ h between the elastic bumps may be formed using the insert plate, and the degree of the height difference may be easily adjusted. And, like the first embodiment, the durability of the air foil thrust bearing can be improved.
  • FIG. 11 is a cross-sectional view showing a portion of an air foil thrust bearing cut in a radial direction according to a third embodiment of the present invention.
  • the air foil thrust bearing according to the third embodiment of the present invention may be largely composed of a base plate 100, a bump foil 200, and a top foil 300.
  • the top foil 300 may be formed in the same manner as in the first embodiment described above.
  • the bump foil 200 may have the same height as the elastic bumps 220 arranged in the radial direction, and the configuration of the rest of the bump foil 200 may be identical to that of the first embodiment described above. there is.
  • the overall shape of the base plate 100 is the same as that of the first embodiment, and only the stepped grooves may be formed with a difference.
  • the stepped groove 110 may be concavely formed along the circumferential direction on the upper surface of the base plate 100 at a portion corresponding to the outer diameter-side elastic bump 220 of the bump foil 200 .
  • the outer diameter-side elastic bump 220 may be inserted into the stepped groove 110 of the base plate 100 and placed therein.
  • the stepped groove 110 of the base plate 100 the heights of the inner diameter-side elastic bumps and the central part elastic bumps are relatively higher with respect to the upper surface of the base plate 100, and the outer diameter-side elastic bumps have a height of becomes relatively low.
  • the height difference ⁇ h between the elastic bumps can be formed using the stepped groove of the base plate, and the height difference can be formed without a separate additional part. And, like the first embodiment, the durability of the air foil thrust bearing can be improved.
  • the height of the elastic bump from the lower surface of the base plate to the crest of the elastic bump d1 is higher than the height of the central elastic bump d1.
  • the heights of (c2, d2, e2, f2) may be formed low.
  • the height difference between the elastic bumps may be in the range of 0.01 mm to 0.2 mm, and if the height difference between the elastic bumps is less than 0.01 mm, the effect of the present invention may not appear, and if the height difference is greater than 0.2 mm, high heat may be generated.
  • FIG. 13 to 15 are an exploded perspective view, an assembled perspective view, and an upper plan view showing an air foil thrust bearing according to a fourth embodiment of the present invention
  • FIG. 16 is a C-C' of an air foil thrust bearing according to a fourth embodiment of the present invention. it is a cross section
  • the air foil thrust bearing according to the fourth embodiment of the present invention may be largely composed of a bump foil plate 500 and a top foil plate 600.
  • the bump foil plate 500 may include a first plate 510 and a plurality of bump foils 520, and may be formed in a form in which the first plate 510 and each bump foil 520 are integrally connected. there is.
  • the bump foils 520 may be arranged spaced apart from each other along the circumferential direction, and each end of the bump foils 520 is connected to the first plate 510, and the rest except for the connected end is connected to the first plate ( 510) and may be spaced apart. That is, only one end of the bump foils 520 in the circumferential direction is connected to the first plate 510 , and inner and outer ends in the circumferential direction are not connected to the first plate 510 and may be separated from each other.
  • the bump foil 520 may be formed in a corrugated or wavy shape by forming concavo-convex elastic bumps 522, and the elastic bumps 522 protrude upward from the upper surface of the first plate 510.
  • the bump foil 520 may be formed in a shape having a shape.
  • the bump foils 520 may be formed with slits 523 penetrating both surfaces in the thickness direction while going along the circumferential direction from the free end. That is, for example, a region in which the elastic bumps 522 of the bump foil 520 are formed by the slits 523 may be divided into three parts in a radial direction. At this time, one end of the three parts may be connected to the first plate 510 .
  • the top foil plate 600 may include a second plate 610 and a plurality of top foils 620, and may be formed in a form in which the second plate 610 and each top foil 620 are integrally connected. there is.
  • the top foils 620 may be arranged spaced apart from each other along the circumferential direction, and one end in the circumferential direction may be connected to the second plate 610 and the rest of the top foils 620 may be spaced apart from the second plate 610. there is. That is, only one end of the top foils 620 in the circumferential direction is connected to the second plate 610, and the inner and outer ends in the circumferential direction are not connected to the second plate 610 but may be separated.
  • top foils 620 are convexly extended from the point connected to the second plate 610 in the circumferential direction, and at the end of the connection portion 621, a plane parallel to the second plate 610 is formed.
  • the portion 622 may be formed in an extended form.
  • the surface of the bump foil plate 500 on which the elastic bumps 522 of the bump foil 520 protrude and the opposite surface of the top foil plate 600 on which the connection portion 621 of the top foil 620 protrudes is formed. They may be stacked facing each other to form one air foil thrust bearing.
  • the air foil thrust bearing of the present invention may be coupled so that the opposite surface of the bump foil plate 500 facing the top foil plate 600 is in contact with the bearing housing 800 to be supported.
  • the bearing housing 800 may be a part where an air foil thrust bearing is placed and mounted in a turbo blower or an air compressor.
  • the bump foil 520 when a cross section of the top foil 620 cut in the radial direction at the portion where the flat portion 622 is located, the bump foil 520 is radially toward the outer diameter.
  • the height h4 of the elastic bumps 522 in the adjacent partial region may be lower than the heights h1, h2, and h3 of the elastic bumps 522 in the central region and the region adjacent to the inner diameter in the radial direction, which is the remaining region.
  • one elastic bump radially adjacent to the outer diameter (on the right side) is the outer diameter side elastic bump
  • the other elastic bump radially adjacent to the inner diameter (left side) is the inner diameter side elastic bump
  • the other elastic bump located at the center in the radial direction is the outer elastic bump.
  • the two elastic bumps are referred to as central elastic bumps
  • the top foil 620 may come into contact with the inner diameter side elastic bumps and the center elastic bumps in a state where no external force such as air pressure acts, and in this state, the outer diameter side elasticity
  • the peak of the bump may be spaced apart from the top foil 620 due to the height difference ⁇ h.
  • the thrust runner which is a rotating body
  • the air flowing between the thrust runner and the top foil may be bent toward the elastic bump 522 by the pressure of the outer diameter side and may not come into contact with the thrust runner. That is, in the area adjacent to the outer diameter in the radial direction, the linear speed is relatively high, so the energy loss (heat) due to friction with air is relatively large. 620 can be damped and rubbed in direct contact.
  • the thrust runner when the thrust runner comes into contact with the top foil 620 due to excitation, etc., it first contacts the flat surface 622 of the top foil 620, and damping and friction occur primarily.
  • the bump foil 520 The flat portion 622 of the top foil 620 corresponding to the area where the elastic bumps on the inner diameter side and the elastic bumps exist in the central portion of the inner diameter side of the inner diameter side and the flat portion 622 of the top foil 620 primarily serves as a main supporting portion for supporting the load of the thrust runner.
  • the air foil thrust bearing of the present invention can have higher durability because the primary damping friction part does not overlap with the region where the energy loss according to the speed of the rotating body is the greatest and is formed at different positions.
  • the direct friction between the thrust runner and the top foil is reduced in the outer diameter side, which is the area where energy loss is greatest, there is an effect that damage (heat marks) to the coating layer coated on the surface of the top foil may not occur.
  • 17 is a cross-sectional view showing a portion of an air foil thrust bearing cut in a radial direction according to a fifth embodiment of the present invention.
  • the air foil thrust bearing according to the fifth embodiment of the present invention may largely include a bump foil plate 500, a top foil plate 600, and an insert plate 700.
  • the top foil plate 600 may be formed in the same manner as in the fourth embodiment described above.
  • the bump foil plate 500 may have the same height as the elastic bumps 220 arranged in the radial direction, and the rest of the first plate 510 and the bump foils 520 may have the same configuration as the fourth described above. It may be formed in the same way as in the embodiment.
  • the insert plate 700 may be formed in a thin flat plate shape, and the insert plate 700 may be stacked on a surface opposite to the bump foil plate 500 on which the top foil plate 600 is stacked.
  • the insert plate 700 may be disposed in a portion corresponding to the rest of the bump foil 520 except for a portion adjacent to the outer diameter side in the radial direction. That is, the insert plate 700 may be disposed in a region where the inner diameter side elastic bumps 522 and the center elastic bumps 522 exist in the radial direction.
  • the heights of the inner diameter side elastic bumps 522 and the center part elastic bumps 522 are relatively high with respect to the upper surface of the bearing housing 800, and compared to this, the outer diameter side elastic bumps 522 ) is relatively low.
  • the height difference ⁇ h between the elastic bumps can be formed using the insert plate, the degree of the height difference can be easily adjusted, and durability of the air foil thrust bearing can be improved.
  • FIG. 18 is a cross-sectional view showing a portion of an air foil thrust bearing cut in a radial direction according to a sixth embodiment of the present invention.
  • the air foil thrust bearing according to the sixth embodiment of the present invention may largely include a bump foil plate 500, a top foil plate 600, and a bearing housing 800.
  • the top foil plate 600 may be formed in the same manner as in the fourth embodiment described above.
  • the bump foil plate 500 may have the same height as the elastic bumps 522 disposed in the radial direction, and the configuration of the other bump foils 520 may be identical to those of the fourth embodiment.
  • a stepped groove 810 may be concavely formed along the circumferential direction on an upper surface of the bearing housing 800 at a portion corresponding to the outer diameter-side elastic bump 522 of the bump foil plate 500 .
  • the outer diameter-side elastic bump 522 may be inserted into the stepped groove 810 of the bearing housing 800 and placed therein. Therefore, as a result of the stepped groove 810 of the bearing housing 800, the inner diameter side elastic bumps and the center elastic bumps have a relatively high height with respect to the upper surface of the bearing housing 800, and the outer diameter side elastic bumps have a relatively high height. becomes relatively low.
  • the height difference ( ⁇ h) between the elastic bumps can be formed using the stepped groove of the bearing housing, and the height difference can be formed without additional parts, and durability of the air foil thrust bearing can be improved.
  • the height difference between the elastic bumps may be in the range of 0.01 mm to 0.2 mm, and if the height difference between the elastic bumps is less than 0.01 mm, the effect of the present invention may not appear, and if the height difference is greater than 0.2 mm, high heat may be generated.
  • connection part connection part
  • 622 flat part

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Support Of The Bearing (AREA)

Abstract

La présente invention concerne une butée de surface portante comprenant : une plaque de base ; une feuille à bosse qui présente des bosses élastiques inégales, et qui est stratifiée sur la plaque de base de telle sorte qu'une partie d'extrémité circonférentielle correspondante est couplée à la plaque de base ; et une feuille supérieure qui y est stratifiée pour recouvrir la feuille à bosse, et qui présente une partie d'extrémité circonférentielle couplée à la plaque de base, la feuille à bosse étant formée de telle sorte que la hauteur des bosses élastiques dans une région partielle adjacente à un côté de diamètre extérieur dans la direction radiale est inférieure à la hauteur des bosses élastiques dans la région restante, la butée présentant ainsi une durabilité supérieure étant donné qu'une partie de frottement d'amortissement primaire est séparée de la région présentant la plus grande perte d'énergie selon la vitesse d'un corps rotatif lors de l'excitation.
PCT/KR2021/018130 2020-09-11 2021-12-02 Butée de surface portante WO2022270697A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR20200116778 2020-09-11
KR10-2021-0082995 2021-06-25
KR1020210082995A KR102590215B1 (ko) 2020-09-11 2021-06-25 에어 포일 스러스트 베어링

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WO2022270697A1 true WO2022270697A1 (fr) 2022-12-29

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KR20170061505A (ko) * 2015-11-26 2017-06-05 한온시스템 주식회사 에어 포일 베어링
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US5584582A (en) * 1994-12-15 1996-12-17 Air Products And Chemicals, Inc. Bump foil design for improved damping and load capacity from compliant foil gas bearings
US20120281936A1 (en) * 2009-10-06 2012-11-08 Hooshang Heshmat Foil thrust bearing applicable to high speed machining center
KR20170061505A (ko) * 2015-11-26 2017-06-05 한온시스템 주식회사 에어 포일 베어링
WO2020137513A1 (fr) * 2018-12-25 2020-07-02 株式会社Ihi Palier à feuilles de poussée et procédé de fabrication de plaque de base de palier à feuilles de poussée
KR101958456B1 (ko) * 2019-01-08 2019-03-14 김유미 냉각유로를 가지는 에어포일 스러스트 베어링

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